Table.
Characteristics of Experimental Exposure Protocol of ApoE-Null Mice Fed a Normal Chow Diet
| Experimental Parameter | |
|---|---|
| Groups | FA, FP, UFP |
| Exposure time (dates) | 11/03/2005 to 12/12/2005 |
| Exposure time (hours) | 75 |
| Total ambient particle no. (particles/cm3) | 3.42 (±0.96)×104 |
| No. concentration in FA chamber (particles/cm3) | <5000 |
| No. concentration in FP chamber (particles/cm3) | 4.56 (±1.06)×105 |
| Calculated UFP no. concentration in the FP chamber (particles/cm3) | 3.88 (±1.06)×105 |
| No. concentration in UFP chamber (particles/cm3) | 5.59 (±1.23)×105 |
| Ratio of UFP in the FP vs the UFP chamber* | 1:1.44 |
| FP chamber particle enrichment factor | 13.35 (±1.6) |
| UFP chamber particle enrichment factor | 16.4 (±1.8) |
| Mass in FP exposure chamber (μg/m3) | 438.29 |
| Mass in UFP exposure chamber (μg/m3) | 112.61 |
| PM2.5 mass in ambient air (μg/m3) | 26.78 |
| UFP mass in ambient air (μg/m3) | 8.43 |
FA, FP, and UFP groups were exposed in a mobile laboratory located in downtown Los Angeles. Values shown are means(±SD).
*
This ratio was obtained by reducing the particle no. in the FP chamber by 15%, which represents the contribution of particles in the 0.18 –2.5 μm range. This also translates into an ≈2-fold increase in surface area if a spherical particle shape is assumed.